[Myka]

You could get a 120g which is 48x24x24" or how about a 60g cube which is 24x24x24"?

Refugiums w/ macros are popular. DSBs eventually fail given a few years most of the time. They are a great way to cause a tank crash down the road. What do you hope to achieve by using a DSB that you can't achieve by using a SSB? I can understand skimmerless (as I run skimmerless myself), however I only recommend that to experienced reef keepers as it provides a plethora of challenges of which most are easily diminished simply by using a quality skimmer.